Grinding machine



Sept 24, 1929. F. HRRELL 1,729,288

G'RNDING MACHINE Filed Oct. 27, 1926 2 Sheets-Sheet 1 A TTORNEYS.

Sept- 24, 1929. F. s. HARRELL 1,729,288

GRINDING MACHINE Filed 0G13. 27, 192.6 2 Sheets-Sheet 2 INVENTOR. /A/v/rS. HARPE/.L

A TTORNEYS.

Patented Sept. 24, 1929 PATENT orties FRANK S. RARE/ELL, F LO'YAL'ION,CALEFORNIA GRNDENG MACHINE Application filed October 27, 1926.

ll`he present invention relates to improvements in boring machines,particularly in those used for boring ory reboring or regrindi ingvcylinders of engines.

'.llhe general object ol my invention is to provide a boring; machine,which can be secured to the cylinder, by the same bolts which are usedto secure the cylinder head to the cylinder, thereby providing` aboring' machine, which can be attached in place ot a cylinder head inany position oiE the cylinder.

A further object of my invention is to provide a boring` machine, whichcan be used in cylinders of all diameters that occur in the every daypractice.

The above and other objects are accomplished by instrumentalitiespointed out in the following;` specilication.

The invention is clearly defined in the claim.

satisfactory embodiment of the invention is illustrated in theaccompanying drawine. forming a part of the specication and in which:

Fie-ure 1 is a side elevation of the invention in use,

Figure 2 is a top plan view of the invention,

Figure 3 is a detail ot' the supporting plate olI my device,

Figure 4 is a cross section taken on Figure 3 line 4 4,

Figure 5 is a perspective view of one of the standards oit my device,

Figure 6 is a fractional section of my dcvice showingY its attachment toan electric motor,

Figure 7 is a sectional detail on the line 7 7 of Figure 6,

Figure 3 is a detail of my adjustable boring` and grinding tool,

Figure 9 is a perspective view of a dise o'li my grinding,` tool,

Figure 10 is a cross section taken on line 10-10, on Figure 8, and

File-ure 11 is a moded adaptation of my invention.

In the drawing;` 15 indicates a cylinder ot any type o1 reciprocatingengine 5 16 is the Serial No. 144,541.

bore of the cylinder, which is bored or ground by the boring device 17.The standards 18 are preferably Z shaped as shown clearly in Figure 5,one end of each standard having;l a. hole 19 for receiving` the bolts 2Owhich will secure the standards 19 to the cylinder 15. 1n the other endof standards 18 is an elongated aperture 21, through which the bolts 22secure the standards 18 to the plate 23. Plate 23 is lixedly secured tothe. casing` o1r1 an electric motor 24 by screws 25.

The hollow shaft 26 of the motor 24 is secured by any conventional meansto the rotor et the electric motor, and is supported in ball bearings 27as shown in Figure G. A solid shaft 23 slidable in the hollow shaft 2G,and rotated with the hollow shaft 26 by means of keys 29 as shown inFigure 7.

The casing;` 30 of the motor is threaded at 31, a scr i 1 32 is extendedthrough the threadk70 ed hole 31 into the solid shaft. The screw 32 hasa ball shaped end 33. A socket 34 is secured to the end of the solidshaft 23 by means of screws 35. The ball 33 and socket 34 form aI balland socket joint, thereby permitting the screw to be rotated andadvanced without rotating the shaft 23.

A handle 3G is secured to the other end ot f the screw 32, 'forturning,` the screw A boring` or grinding tool 37 is attached to theshatt 23, and is held. in place by a set screw 39. rlhe end oli theshaft 28 is square and is secured into the square hole 4() of the frame38. Plates 41 and 42 are integral parts ot frame 33. Fach of the plates41 extends parallel with a plate 42, thereby forming` two receptaclesfor the carborundum discs 43. The discs 43 are secured between theplates 41 and 42 by means of bolts 44. An elongated aperture 45 oit thediscs 43 permits the lateral adjustment of the discs. o

r1`wo bearings 46 are extended from the frame, at right angles to theplates 41 and 42, and support threaded rods 47, the rods 47 having alefthand screw at one end as at 43, and a riglithand screw at the otherend as at 49. The screws 43 and 49 are secured in the threaded wall ofthe holes 50 of the discs 43.

Adjusting wheels 5l are iixedly secured on rods 4:7, atabout the center,between the `forks of the bearings 46.

My invention operates as Jfollows:

Bolts 22 can be placed through the elongated aperture 2l, thereby thedevice can be secured in place on the cylinder head, by the standardbolts.

The rotating motor will rotate the solid shaft 28 and the cutting tool37. To advance the cutting tool into the cylinder bore 16, the operatorturns the handle 36, thereby advancing screw 32, which in turn advancesthe solid shaft 28 in the hollow shaft 26.

The ball 33 and socket 3st joint prevents the advancing screw' tointerfere with the rotation of the cutting tool.

The adjustment of the cutting tool to ditferent bore diameters can beeffected by loosening the bolts 44C then turning the adjusting wheels5l, the wheels turn the screws 47 and a8 in the holes 50, thereby movingthe carborundum discs 42) toward or away 'trom the center, maKing theboring diameter smaller or larger respectively. Then by tightening upthe bolts 44:, the t-ool is fixed in the desired position.

A chuck 52 for receiving a drill. bit may be secured in place 0I" theboring or grinding` tool.

A device is shown in use as a drilling machine in Figure ll.

Although I have shown and described one embodiment ot my invention, itis to be understood that the same is susceptible et various changes andI reserve the right to einploy such as may come within the scope of theappended claim.

I claim:

A grinding machine comprising a support7 a motor carried thereby, ahollow shaft rotated by said motor, a solid shaft slidable in saidhollow shaft and turnable therewith, a tool carried by said solid shaft,means for advancing said solid shaft while it is rotating, said meansincluding a manually actuated screw and a ball bearing ldisposed betweenthe end of said screw and said solid shaft, and means for adjusting thelongitudinal axis of said solid shaft laterally with respect to saidsupport.

FRANK S. I-IARRELL.

